Swing sander



y 24, 1951 H. s. NEWTON 2,561,589

swmc SANDER Filed Sept. 25, 1948 3 Sheets-Sheet 1 #69444 S/lwrorv 35 INVENTOR.

ATTORNAZY H. S. NEWTON July 24, 1951 SWING SANDER s Sheets-Sheet I 2 Filed Sept. 25, 1948 /%ERM#/u S A EWFO/V INVENTOR.

y 24, 1951 H. s. NEWTON 2,561,589

SWING SANDER Filed Sept. 25, 1948 5 Sheets-Sheet 3 4/7 fine/144m J? /VEW7O/V INVENTOR.

ATTOR/VEY Patented July 24, 1951 SWING SANDER Herman S. Newton, Temple, Tern, assignor to Vonnegut Moulder Corporation, Indianapolis,

Ind.

Application September 25, 1948, Serial No. 51,235

I 1 Claim.

This invention relates to polishing, abrading and sanding machines and more particularly to such a machine adaptable to Wood and metal working.

The principal object of the invention is to broaden the scope of operations of the sanding machine described in U. S. Letters Patent No. 2,416,493 issued February 25, 1947, in which the objects are: to provide an all purpose sanding machine, in the sense that it possesses interchangeable facilities by which it may be converted into a belt sander, grinding machine and buffing machine. The present invention augments the objects of the aforesaid patent through and by virtue of a novel form of ceiling suspension having a radial arm for greater working latitude, the suspension being'flexible to lend freedom of movement to the machine and increasing flexibility.

Another object of the invention is to provide a sanding machine which is so connected to its suspension means that it can be rotated about its longitudinal axis in order to perform on work ordinarily difficult or" access.

Another object of the invention is to provide a spring counterbalance for returning the machine automatically to a normally horizontal position from any one of several angular worklog positions. Moreover, the invention provides a spring counterbalance in the vertical suspension column, the latter being liliewise equipped with means for effecting vertical adjustment of the machine as well as a normally relaxed flexible means as a safety feature to intercept the vfall of the machine in event of failure of the springsuspension counterbalance.

With the foregoing objectsin view, the invention has further reference to certain. features of accomplisi-iment which will become apparent as the description proceeds, taken in connection with the accompanying drawings wherein:

Figure 1 a. perspective View of a radial swing sanding machine and suspension, constructed according to the present invention.

Figure 2 is a side elevational view.

Figure 3 is a plan view on .a slightly reduced scale.

Figure 3A is a fragmentary view partlyin section showing the relationship of the machine counterbalancing spring with themotor.

Figure 4 is a fragmentary view of the suspen sion column partly in longitudinal cross-section to reveal the ceiiing spring counterbalance and sa-fiety suspension chain.

(Cl. 51 m) 2 Figure 5 is a fragmentary view of the grind wheel adapter partly in vertical section.

Figure 6 is a perspective view of the floor stand per so with a portion of its midsection cut away.

Figure '7 is another plan view, partly in section to reveal the sanding belt tensioning spring and angle adjustment clamp, and

Figure 7A i a detail view of one of the two straps by which the sanding belt guard is secured. Continuing with a more detailed description of the drawing, reference numeral ill denotes a tubular body portion, one end of which enters the core of a boss ll cast integral with a support 12 for the motor 13,. The member IE! is secured against displacement with respect to the boss H by a set screw I l. The opposite end of the tubular body member Ill telescopically receives a complementary body member I5 (Fig. 7) against which bears at one end, a coil spring It housed in the member ill, to exert a force tending to urge the complementary member l5 out of the member id but restrained by a set screw lBa, passing through a split collar ll, surrounding the member to and on which is abracket it, carrying a lateral arm i9 which latter, in turn, supports a sanding belt guard 23, to which further reference will be made presently.

The outer end of the. complementary body member it enters a boss 2! formed on a yoke 22, the latter embracing a spindle bearing 23, in which is journaled the spindle which carries a pulley 24 on which the sanding belt25 is mounted. The bearing sleeve 23 is connected to the yoke 22 by opposed pivots 25 above andbelow the latter (Fig. 2) so that the angle of the spindle may be changed in relation to the longitudinal axi of the machine body to insure true tracking of the belt 25 on the pulleys it and 2?, the latter pulley being mounted on the shaft 28 of the motor l3 (Fig. 7). The means for accomplishing this i in the form of an adjusting screw 29 threaded through the yoke 22 to bear against the bearing sleeve 23 in offset relation to the pivotal pointsZS.

A manipulating handle 3i! isattached to the top of the yoke 22 through the medium of an angular arm 3% which is secured by means of the upper pivot bolt 2%. Auxiliary hand grips 32 are arranged on each side of the handle 30 to facilitate rotation of the machine about its longitudinal axis.

The belt guard 28 is held in position over the sanding belt 25 by the lateral arm IQ, previously mentioned and a companion arm 33 (Figs. 3 and '2) attached to the motor support 12. The arm 33, as well as arm i9 is provided with a slotted aperture 33a to receive a thumb screw Me by which it is secured to the motor support i2 for lateral displacement. In like manner, arm i9 is secured to the bracket It by a thumb screw 35a. The forward section 34 of the guard is,

hinged at so that it may be raised to accommodate a grinding wheel (Fig. 5) replacing the belt and pulley 24, and yet afford a shield against grindings when applying work to the wheel. Further reference to the grinding wheel and its mode of attachment will be made presently. Peep holes 38 are provided in the hinged portion 34 of the belt guard 28 as in Figures 1, 3 and 7 through to enlarge its range of operations, a form of suspension therefor is shown in Figures 1 and 4. A bifurcated casting 31 is formed with a sleeve 38 on its lower end, which sleeve embraces a tubular bearing 39 (Fig. 7) formed on a collar 40, which latter, in turn, embraces the tubular body section to. A cap M is formed on the outer leg of the bifurcated casting 37 which receives the outer end of the tubular bearing 39 and through the medium of a hand wheel =32, a set screw 43, extending axially through the bearing 39 and threaded into the collar 4!], is caused to bear against the tubular body section l8 and secure the entire machine against rotation about its longitudinal axis or to hold the sam'ein adjusted angular positions with respect to the longitudinal axis thereof.

The relationshi of the sleeve 38 and bearing 39 enables the machine to be oscillated on the bearing to dispose the same in an inclined plane. A set screw 44 secures the machine in adjusted inclined positions.

Secured to the top of the casting 3? by bolts 45 is a plate 46 and to this plate is aflixed a suspension column for the machine consisting of a pipe 4'l. Telescopically receiving the upper end of the pipe 4? is a tube 48 (Fig. 4). A transverse bolt 49 passes through the tube 48 at its upper end and to this bolt is attached the upper end of a coil spring 58, the lower end thereof being secured at 5| to the upper end of the pipe 41 within the tube 48. Thus, the machine is suspended for vertical movement by the spring 50, which movement may be prohibited by means of a set screw '52 (Fig. 1) passing through the tube 48 adjacent the lower end and engaging the column 41.

To prevent damage of the machine by falling in event of breakage of the spring suspension 50 or failure of its connections, a link chain 53 is also housed in the tube 48 with its upper end connected to the bolt 40 and its lower end joined to the upper end of column 41 at El. The chain is normally relaxed and is effective to support the machine only in event of failure of the spring 5!).

Installed in the top of the tube 48 is a plug 54, recessed to retain a ball bearing 55. A bifurcated member 56 has a shank extending through an opening in the plug 54 and is provided with a head 51 on which rests the bearing 55 to support the entire assembly therebelow for unrestricted, rotation. A cotter key v58 prevents longitudinal moved effortlessly along the arm 64 for radial (Fig. l).

displacement of the machine suspension with respect to a ceiling support consisting of a mounting plate 66 having 2. depending shaft 67 A collar fit attached to the end of the suspension arm 64 embraces the shaft 6'! and is held rotatably thereon by means of a washer to and a cotter key 10.

To hold the arm 64 in adjusted positions, a set screw II is threaded through the collar 68 to bear against the shaft 57 and is actuated by an operator standing on the floor through a chain 72 whose ends are connected to a transversepin 73 extending through the head of the set screw l l. A stop 14 at the outer end of the radial suspension arm 64 prevents the yoke 62 and hanger 63 from rolling off the end of the arm.

Returning now to the counterbalancing fea tures of the machine itself, reference is made to Figures 1 and2 particularly in which is shown a coil spring 75, the lower end of which is connected "to the outer end of an arm 76. The 0pposite end of this arm is pivotally connected at H (Fig. 2) to the bottom of the motor l3 to oscillate about a vertical axis. The upper end of the spring 15 is connected to a hanger 18 shown in dotted lines in Figure 2 as being a part of the lower end of a tension adjusting screw 19. A knurled nut is provided for longitudinally moving the screw i9 to increase or decrease the tension on spring 75.

The hanger 1'8 is stationary with respect to the sleeve bearing 39, due to the fact that the hanger is mounted on an arm 18a which is an integral part of the cap 4| and which cap is secured to the sleeve bearing 39 by means of a set screw 18b (Fig. '7).

The object inso arranging the spring 15 is to enable the machine to be rotated about its horizontal and transverse axis about its bearing 39 to an angle of degrees to the right and approximately 45 degrees to the left as viewed in Figs. 1 and 2 without sacrificing any of the counterbalancing effects of the spring.

When the machine is thus rotated to the right by the handles 32 the spring 15 will expand and the arm 16 will swivel on its pivot 11 when the angle of the machine is changed with respect to the horizontal. In other words, the oscillation of the arm 16 about its pivot makes possible the manipulation of the machine to a variety of different angular positions in its vertical plane without losing the counterbalancing effects of the spring 15 which tends to return the machine to the normal horizontal position shown in Figure 2.

Frequently, it is desired to secure the machine in a rigid horizontal position and convert the same into a grinder. To accomplish this, a floor stand is provided (Fig. 6) consisting of a base 8! with provisions at 82 for securing the same to a floor. An upright 82a is mounted on the base and carries a saddle 83 on its upper end in which is placed the collar 38 of the machine,

said collar being situated at the approximate center of gravity of the machine. A set screw 84 on the saddle 83 bears against the collar 38 to hold the machine securely in place in the saddle.

In Figure 5 is shown a grind wheel adapter consisting of a pulley 85 grooved to accommodate a V-belt 86 which latter is driven by a V-pulley 86a (Fig. 7) mounted on the shaft of motor l3. The pulley has an elongated and threaded hub 81 on which is mounted a grinding wheel 88. A retaining flange 89 is threaded onto the hub 81 against the grinding wheel 88, followed by a lock nut 98. An opening 91 is provided in the retaining flange 89 to receive a tool for loosening and tightening the flange.

In operating the machine as a belt sander the sanding belt 25 is applied by loosening the set screw 1611 which looks the tubular body sections In and I5 against relative displacement. The section I5 is then thrust inwardly against the resistance of the spring it within section Ill. The belt 25 is then mounted on pulleys 24 and 21 whereupon the body section 15 is released and is extended by pressure of the spring 16 and thus imposes tension on the belt 25.

The machine may be operated as a sander when swinging from the vertical suspension or when secured on the floor stand shown in Figure 6.

When the machine is to be converted to a grinder, the pulley 24 is replaced by the adapter shown in Figure 5 and a conventional V-belt pulley is substituted for the pulley 21 on the motor shaft and a V-belt 86 is mounted on the pulleys. It is necessary also to secure the machine in the described manner on the floor stand when using the same as a grinder.

It will be observed in Figures 1, 2 and 3 that a switch 91 is mounted on the bifurcated casting 31 for controlling current to the motor I 3 through conduit 92.

Manifestly, the construction as shown and described is capable of some modification and such modification as may be construed to fall within the scope and meaning of the appended claim is also considered to be within the spirit and intent of the invention.

What is claimed is:

In a sanding machine having body members composed of telescopically related elements, a

driving motor supported by one of said members at one end of said machine, a suspension means for said machine comprising a collar embracing another of said body elements, a lateral extension on said collar, a sleeve rotatable on said lateral extension, a casting integral with said sleeve, a suspension column composed of a pair of tubular telescopically related sections, the lower of which is attached to said casting at its lower end, a ceiling mounting plate having a stub shaft thereon, a suspension arm mounted for radial displacement on said shaft, a yoke movable longitudinally on said suspension arm and having swivel connection with the upper end of said suspension column, a coil spring within said column supporting the weight of said sanding machine within the limits of relative displacement of the tubular sections of said suspension column, means for releasing and securing said collar and sleeve for angular adjustment of said sanding machine, an arm pivoted at one end on the under side of said motor, a spring hanger above said motor, a coil spring connected between said hanger and pivoted arm to resist forces tending to displace said machine from its normal horizontal position, the arm being adapted to oscillate about a vertical axis, and means for securing the sections to said suspension column in vertically adjusted positions.

7 HERMAN S. NEWTON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,112,015 Lichter Sept. 29, 1914 1,425,121 McFeaters Aug. 8, 1922 1,680,958 Stratton Aug. 14, 1928 1,890,675 Doerr et al. Dec. 13, 1932 1,966,930 Leander July 17, 1934 2,070,257 Coates Feb. 9, 1937 2,333,507 Bair et a1. Nov. 2, 1943 2,452,206 Newton Oct. 26, 1948 FOREIGN PATENTS Number Country Date 220,704 Great Britain Aug. 18, 1924 

